Original scientific paper

Basic characteristics of hydraulic model for the Velika Ciglena geothermal reservoir

Srećko Čubrić

Abstract

The large potential of the Velika Ciglena geothermal reservoir has not been utilized in the last 20 years. During the review of predictive values, possible inflow of 7 200 m3/d (170 °C; 28 bar) has been viewed as fairly possible. In that respect the designers are very convincing, since the flow path of fluids through the well is clear and well known. However, with respect to utilization life at constant temperature (20-24 years), they are not credible enough, since it was not easy to prove the flow path of fluids from the injection to the production well. The course of data collection about reservoir characteristics, which were the basis for construction of the reservoir's hydraulic model, is shown. The role of super-permeable fractured zones cooling with loss of drilling mud was stressed. These zones are actually reverse faults. They were identified by temperature measurements following the drilling operations and injection tests. These measurements, together with well logging data, seismic prospecting and interference test were used for the construction of reservoir's hydraulic model. The paper discusses reliability of such a model. Possibilities to increase the hydraulic model reliability were also reviewed.

Keywords

fractured geothermal reservoir; cooling effect; interference test; hydraulic model

Hrčak ID:

84305

URI

https://hrcak.srce.hr/84305

Publication date:

30.6.2012.

Article data in other languages: croatian

Visits: 2.747 *